Arrange over-plotted points in a sunflower pattern and dodge groups side-to-side

This function applies the sunflower position adjustment alongside the dodge position adjustment, arranging overlapping points per x, y, and group into a sunflower pattern. See the sunflower() documentation for more information.

Usage

position_sunflowerdodge(width = 1, density = 1, aspect_ratio = 1)

Arguments

width

The dodging width, which defaults to 1.

density

The pattern density, which defaults to 1 but will have to be adjusted in most cases. The desirable density will depend on both the ranges of the axes and the dimensions of the image.

aspect_ratio

An aspect ratio adjustment to compensate for distortion of the circular arrangement, which might occur when plotting if coord_equal() is not used. A wide aspect ratio (eg. 2) would adjust for vertical stretching, whereas a tall aspect ratio (eg. 0.5) would adjust for horizontal stretching. The default aspect ratio of 1 is appropriate when no adjustment is required.

Value

A ggproto object of class PositionSunflowerDodge.

See also

Other Functions: position_circlepack(), position_circlepackdodge(), position_jitter_ellipse(), position_jitterdodge_ellipse(), position_sunflower(), sunflower()

Examples

  library(ggplot2)

  # Use the sunflower dodge position function to arrange and dodge N points.
  N <- 300

  dat <- data.frame(
    x = sample(1:2, size = N, replace = TRUE),
    y = sample(1:7, size = N, replace = TRUE),
    type = factor(sample(LETTERS[1:2], N, replace = TRUE))
  )

  # With coord_equal
  ggplot(dat, aes(x, y, color = type, shape = type)) +
    geom_point(position = position_sunflowerdodge(width = 0.5, density = 2, aspect_ratio = 1)) +
    coord_equal()


  # Without coord_equal, might want to play with aspect ratio to get a pleasing plot
  ggplot(dat, aes(x, y, color = type, shape = type)) +
    geom_point(position = position_sunflowerdodge(width = 0.5, density = 10, aspect_ratio = 1/4))